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bmp180: fix temperature type conversion

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This commit is contained in:
Alan Wang
2020-07-08 05:47:38 +08:00
committed by GitHub
parent 07ca36ac5a
commit 5ebc7cb09e
1 changed files with 4 additions and 4 deletions
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bmp180/bmp180.go
+4 -4
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@@ -125,7 +125,7 @@ func (d *Device) ReadPressure() (pressure int32, err error) {
}
// rawTemp returns the sensor's raw values of the temperature
func (d *Device) rawTemp() (int16, error) {
func (d *Device) rawTemp() (int32, error) {
d.bus.WriteRegister(uint8(d.Address), REG_CTRL, []byte{CMD_TEMP})
time.Sleep(5 * time.Millisecond)
data := make([]byte, 2)
@@ -133,12 +133,12 @@ func (d *Device) rawTemp() (int16, error) {
if err != nil {
return 0, err
}
return readInt(data[0], data[1]), nil
return int32(uint16(data[0])<<8 | uint16(data[1])), nil
}
// calculateB5 calculates intermediate value B5 as per page 15 of datasheet
func (d *Device) calculateB5(rawTemp int16) int32 {
x1 := (int32(rawTemp) - int32(d.calibrationCoefficients.ac6)) * int32(d.calibrationCoefficients.ac5) >> 15
func (d *Device) calculateB5(rawTemp int32) int32 {
x1 := (rawTemp - int32(d.calibrationCoefficients.ac6)) * int32(d.calibrationCoefficients.ac5) >> 15
x2 := int32(d.calibrationCoefficients.mc) << 11 / (x1 + int32(d.calibrationCoefficients.md))
return x1 + x2
}